Polarizing Plate Embossed Patterns Reduce Moiré
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Solution Overview
Problem
Liquid crystal displays suffer from lower side contrast and prominent Moiré patterns due to the use of patterned optical films, which are ineffective in large-area displays, leading to color shift and visibility issues.
Innovation Solution
A polarizing plate with a pattern layer featuring embossed optical patterns and a flat section, where the wave pattern has a specific height ratio and pitch, and a base angle, to reduce Moiré patterns and improve contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a pattern structure is used in a viewer-side polarizing plate to improve front contrast and reduce side color shift, then front contrast and side color shift are improved, but Moiré patterns become more prominent
Solution Approach 1:
The pattern layer is divided into multiple resin layers (first resin layer and second resin layer) with different functions. The first resin layer contains the embossed optical patterns while the second resin layer provides a flat surface, segmenting the functions of pattern formation and Moiré reduction into separate layers working together
Solution Approach 2:
The embossed optical patterns are designed with specific local characteristics including wave patterns with controlled height ratios (20%-60%) and pitch (100-400 μm), creating localized optical properties that improve front contrast while the flat sections between patterns provide localized Moiré reduction
2Object-generated harmful factors
If a pattern structure is tilted at a certain angle with respect to pixels to reduce Moiré patterns, then Moiré patterns are reduced, but the effect is hardly effective in large-area optical display apparatus
Solution Approach 1:
Instead of tilting the entire pattern structure in the plane (2D rotation), the invention uses vertical embossed patterns with wave patterns extending in the thickness direction (3D structure). This dimensional change allows Moiré reduction to be effective across large display areas without relying on planar tilting angles
3Device complexity
If light is incident at a right angle to the screen to simplify the backlight structure, then the backlight structure is simplified, but side contrast becomes lower than front contrast causing color shift
Solution Approach 1:
The embossed optical patterns have specific geometric parameters including wave pattern height ratios of 20%-60% and pitch of 100-400 μm. These parameter optimizations enable the patterns to effectively control light distribution angles, improving side contrast while maintaining perpendicular light incidence and simple backlight structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The polarizing plate effectively reduces side color shift and Moiré patterns while enhancing both front and side contrast, even in large-area displays.
Implementation Method 1
each of the embossed optical patterns includes an upper surface defining a wave pattern
Implementation Method 2
the wave pattern has a pitch of greater than about 100 μm and less than about 400 μm
Implementation Method 3
a polarizing plate includes: a polarizer; and a pattern layer formed on a surface of the polarizer
Data Source
AI summary
A polarizing plate and an optical display apparatus including the same are provided. A polarizing plate includes: a polarizer; and a pattern layer on a surface of the polarizer and including a first resin layer and a second resin layer facing the first resin layer, the first resin layer including a patterned portion located at at least a portion thereof facing the second resin layer, the patterned portion includes at least two embossed optical patterns and a flat section formed between a pair of adjacent embossed optical patterns, each of the embossed optical patterns includes an upper surface defining a wave pattern, and the wave pattern has a value of about 20% to 60%, as calculated according to Formula 1 herein, and a pitch of greater than about 100 μm and less than about 400 μm.